Fix dead lock when jumping backwards in time during rendering

A jump backwards in time entails unloading the current world and with it
the ChunkRenderDispatcher that the ChunkLoadingRenderGlobal has locked.

src/main/java/com/replaymod/render/hooks/ChunkLoadingRenderGlobal.java

@@ -22,15 +22,30 @@ import static com.replaymod.core.versions.MCVer.*;
 public class ChunkLoadingRenderGlobal {
 
     private final RenderGlobal hooked;
-    private final ChunkRenderDispatcher renderDispatcher;
+    private ChunkRenderDispatcher renderDispatcher;
-    private final JailingQueue<ChunkCompileTaskGenerator> workerJailingQueue;
+    private JailingQueue<ChunkCompileTaskGenerator> workerJailingQueue;
-    private final CustomChunkRenderWorker renderWorker;
+    private CustomChunkRenderWorker renderWorker;
     private int frame;
 
     @SuppressWarnings("unchecked")
     public ChunkLoadingRenderGlobal(RenderGlobal renderGlobal) {
         this.hooked = renderGlobal;
-        this.renderDispatcher = renderGlobal.renderDispatcher;
+
+        setup(renderGlobal.renderDispatcher);
+    }
+
+    public void updateRenderDispatcher(ChunkRenderDispatcher renderDispatcher) {
+        if (this.renderDispatcher != null) {
+            workerJailingQueue.freeAll();
+            this.renderDispatcher = null;
+        }
+        if (renderDispatcher != null) {
+            setup(renderDispatcher);
+        }
+    }
+
+    private void setup(ChunkRenderDispatcher renderDispatcher) {
+        this.renderDispatcher = renderDispatcher;
         this.renderWorker = new CustomChunkRenderWorker(renderDispatcher, new RegionRenderCacheBuilder());
 
         int workerThreads = renderDispatcher.listThreadedWorkers.size();

src/main/java/com/replaymod/render/mixin/MixinRenderGlobal.java

@@ -9,6 +9,7 @@ import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.Redirect;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 //#if MC<10904
@@ -66,4 +67,18 @@ public abstract class MixinRenderGlobal {
             ci.cancel();
         }
     }
+
+    @Inject(method = "setWorldAndLoadRenderers", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/renderer/chunk/ChunkRenderDispatcher;stopWorkerThreads()V"))
+    private void stopWorkerThreadsAndChunkLoadingRenderGlobal(CallbackInfo ci) {
+        if (replayModRender_hook != null) {
+            replayModRender_hook.updateRenderDispatcher(null);
+        }
+    }
+
+    @Inject(method = "loadRenderers", at = @At(value = "RETURN"))
+    private void setupChunkLoadingRenderGlobal(CallbackInfo ci) {
+        if (replayModRender_hook != null) {
+            replayModRender_hook.updateRenderDispatcher(renderDispatcher);
+        }
+    }
 }